Gustav  ernst kott



No. 6",579. Patented Sept. 27, I898.

G.-E. KOTT.

SEWING MACHINE.

(Application filed Apr. 5, 1897.) (N o M o d e I 2 Shegts-Sheet I.

Witnesses: ,(zqvewfaz n' hawk flmm. flfforne j No. 6l|,579.

(No ModeL) Patented Sept. 27, I898.

G. E. KOTT.

SEWING MACHINE.

(Application filed Apr. 5, 1897.)

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Mrs ATES' GUSTAV ERNST KOTT, OF OI-IEMNITZ, GERMANY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 611,579, dated September 27, 1898.

Application filed April 5,1897. Serial No. 630,817. (No model.) Patented in Germany July 29, 1896, No. 91,680, and in England August 7, 1896, N0 17,476.

To all whom it may concern.-

Be it known that I, GUSTAV ERNST Korr, a subject of the King of Saxony, residing at Chemnitz, Germany, have invented certain new and useful Improvements in Double- Ohain-Stitch Sewing-Machines, (patented to me in Germany July 29, 1896, No. 91,630, and in England August 7, 1896, No. 17,4765) and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In the art of glove-making the finest and most elegant fabrics made of the very finest threads in small loops are employed for the production of gloves. The seam must be adapted to the fineness of the fabric, and I have succeeded in producing a double-loopstitch machine by which it is possible to narrow the stitches in the seam considerably (about thirty to thirty-five stitches to the inch) and to employ a very fine needle without endangering the loops of the fabric, which in the ordinary sewing-machines used heretofore are generally broken even by the finest needles. In the first place it is necessary to make the needle and its stroke as short as possible, for a very long and fine needle vibrates; secondly, at a small stitch the needle must be caught with certainty into the loop of the looper-thread. The double-chain-stitch machines know up to the present time are so constructed that the looper has to wait until the needle has passed through the loop of the looper-thread, and therefore the needle must remain with its eye at least so long before the looper until the latter has made a backward-and-forward oscillation, which can be effected in highspeed machines only by means of a comparatively long needle having a great length of stroke. I have made provisions so that the looper need not wait until the eye of the needle has passed, so that the needle can be short and yet very fine, and in my construction the looper has ample time to enter into the loop of the needle when the latter begins its'up ward motion. 1 I11 the accompanyingdrawings my machine is shown in Figure 1 in side elevation. Fig. 2 is a plan View of the same, the plate and head being taken away. Fig. 3 is a front view of the machine, and Figs. 4. to 7 illustrate in detail and on an enlarged scale the formation of the stitches. V

The looper cl is secured to the end of a vito and fro. Said shaft 1) receives its oscillations by means of an arm 7t, carrying a roll a", engaging the groove of a cam c on the main shaft a.

A tooth e of special construction is secured to the end of a bent arm g, which is pivoted to the frame at wand has a pin with a roll engaging the groove of a cam e of the main shaft a. Y r

The motion of the needle and the motion of the feeder is effected in the ordinary wellknown manner by means of the common elements, which need not be described here.

The stitches are formed in the following manner, (illustrated in Figs. 4: to 7:) When the needle n, carrying the upper thread f, has formed a loop, the point of the looper d, carrying the lower thread f enters into the loop of the upper thread, as shown in Fig. 4. in side elevation and Fig. 4 in plan View, whereupon the needle 0?. passes out. (See Figs. 5 and 5%) While the fabric is now advanced, the tooth e on arm g is moved outwardly and, catching the lower thread f forces it laterally away from the looper, as.

clearly seen in Figs. 6 and 6. Thus the needle cannot strike the thread even when the smallest possible stitch is executed, and the looper, Without the necessity of waiting, can go back while theneedle descends, and finally the tooth e is thrown back, as shown in Figs. 7 and 7, and the threads are drawn out.

Having thus described my invention, what 'bratory shaft 6, guiding the lower thread f I claim, and desire to secure by Letters Patlated to operate the spreader; substantially 1o ent, isas described.

In a sewing-machine, a driving-shaft, car- In testimony whereof I affix my signature rying a cam-groove, an oscillating looper, a in presence of two Witnesses. 5 reciprocating needle, a lever as g pivotally r supported at one end and carrying at the GUSFAV ERNSP KOTT' other end a spreader, and provided with Witnesses: means intermediate of the ends for engaging ENGHABEL, said cam=groove,.whereby the lever is oscil- JOSEPH P. FOX. 

